i saw a good true sine wave inverter in sim lim tower...its the cotek brand..metallic blue casing...damn cool looking...rated about 600W continuous pure sine wave output...about 400plus SGD....
another brand...Geni@s Pow#r....they have a pure sine wave version also...highest wattage about 300W continuous, 1000W peak surge output....it is good enough for lights and other use...but don't waste your time trying it on your expensive pumps like eheim pump for long period of time....cannot tahan...my personal opinion...
anyway, singapore power seldom lose power also lah...its just kiasu safeguard